Vit D from the Sun, they say 'because of a lack of Vit D is found amongst women who wear the Burkha.
So there you have it, another reason to uncover, Oh! On the other hand you 'sun-worshippers can always get skin cancer, Who me ? 'I don't even smoke, I just inhale car-fumes...yeh yeh yeh....

Ref: R4 food Program